115 lines
3.0 KiB
C
115 lines
3.0 KiB
C
/*-
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* Copyright (c) 2007 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Christos Zoulas.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/param.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdarg.h>
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#include <limits.h>
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#include <unistd.h>
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#ifdef NEED_SETPROCTITLE
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extern char **__environ;
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void
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setproctitle(const char *fmt, ...)
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{
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va_list ap;
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char buf[1024];
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int len;
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char *pname, *p, *s;
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/*
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* Assumes that stack grows down, and than environ has not bee
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* reallocated because of setenv() required growth. Stack layout:
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*
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* argc
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* argv[0]
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* ...
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* argv[n]
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* NULL
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* environ[0]
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* ...
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* environ[n]
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* NULL
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*/
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/* 1 for the first entry, 1 for the NULL */
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char **args = __environ - 2, *s;
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#ifdef _SC_ARG_MAX
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s = (char *)sysconf(_SC_ARG_MAX);
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#elifdef ARG_MAX
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s = (char *)ARG_MAX;
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#elifdef NCARGS
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s = (char *)NCARGS;
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#else
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s = (char *)(256 * 1024);
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#endif
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/*
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* Keep going while it looks like a pointer. We'll stop at argc,
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* Which is a lot smaller than a pointer, limited by ARG_MAX
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*/
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while (*args > s)
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args--;
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*(int *)args = 1; /* *argc = 1; */
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pname = *++args; /* pname = argv[0] */
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/* Just the last component of the name */
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if ((p = strrchr(pname, '/')) != NULL)
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pname = p + 1;
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/* In case we get called again */
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if ((p = strrchr(pname, ':')) != NULL)
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*p = '\0';
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va_start(ap, fmt);
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if (fmt != NULL) {
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len = snprintf(buf, sizeof(buf), "%s: ", pname);
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if (len >= 0)
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(void)vsnprintf(buf + len, sizeof(buf) - len, fmt, ap);
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} else
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(void)snprintf(buf, sizeof(buf), "%s", pname);
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va_end(ap);
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(void)strcpy(pname, buf);
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}
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#endif
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#ifdef TEST
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int
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main(int argc, char **argv)
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{
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setproctitle("foo");
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sleep(1000);
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return 0;
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}
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#endif
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